- pentolite
- pepita
- pepper
- peppermint
- peptizator
- peracid
- perch
- perched
- perchlorate explosive
- perchromic
- percolating water
- percolation filter
- percolation water
- percussion mark
- perfect crystal
- perfect plate
- perfluoroelastomer
- perforated bottom
- perforated plate
- perforated washer
- perforating gun
- performance index
- performance number
- perfume
- pencil lead
- pendulum hardness
- penetrating oil
- penetration
- penetration twin
- penetrometer
- Penex process
- pentabasic alcohol
- pentacid base
- pentane
- pentanol
- penten
- pentyl
- pentyl alcohol
- peppermint oil
- peptize
- peptizer
- peptolysis
- peracetic
- perched aquifer
- perched block
- perchloric
- perchlorinated
- percolation
- percrystalline
- percussion fuse
- percussion system
- percussion welding
- perennial stream
- perfect cleavage
- perfect condition
- perfect fluid
- perfect lubricant
- perfect lubrication
- perfect solution
- perforate
- perforated
- perforated tray
- perforating
- perforation
- perforator
- perfumery oil
- peri-position
- periclinal structure
- periglacial
- perilla oil
- perimagmatic
- perimagmatic deposit
- periodic chart
- periodic reaction
- periodic table
- peripheral moraine
- peripheral velocity
- peritectic reaction
- peritectoid
- perlon
- permafil
- permanent deformation
- permanent elongation
- permanent precipitation
- permanent wear
- permeability logging
- permeable rock
- permenganic
- permissible overload
- permitted production
- peroba
- peroxide number
- peroxidize
- perpendicular displacement
- perpendicular separation
- perpendicular slip
- perrhenic
- persalt
- persistent fossil
- persorption mixture